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The value of an error usually depends on the degree of the error, and then on its condition.
Any error that would be pulled from circulation would likely have a higher value than those that would be allowed to go into circulation.

Generally, extra paper errors and errors with print missing are the most popular among the Irish notes, in my experience.
Around 300 Euro for a B or C Series error, and around 400-500 for a Lavery error. Used notes, a bit less.
A slipped digit error is too minor to command a big premium.

The most interesting type of error note would be a replacement note with an error on it.